Casting material made of a copper-zinc alloy, method for producing a cast product and cast part
Abstract
A casting material made of a copper-zinc alloy with the composition in wt. %: Cu: 58.0 to 66.0%, Si: 0.15 bis 1,2%, P: 0.20 to 0.38%, Sn: up to 0.5%, Al: up to 0.05%, Fe: up to 0.3%, Ni: up to 0.38, Pb: up to 0.25%, Bi: up to 0.1% Te, Se, In, each up to 0.1%, B: up to 0.01%, with the rest being Zn and unavoidable impurities. The alloy has α-phase, β-phase and phosphide particles. The proportion of β-phase in the sum of the α-phase and β-phase is 20 vol. % and max. 70 vol. %. In an area of 21000 μm2 there are 20 to 300 phosphide particles with an equivalent diameter of 0.5 to 1 μm, 30 to 120 phosphide particles with an equivalent diameter of 1 to 2 μm, and 20 to 100 phosphide particles with an equivalent diameter of 2 to 5 μm.
Claims
exact text as granted — not AI-modified1 . A casting material composed of a copper-zinc alloy having the following composition in % by weight:
Cu: 58.0% to 66.0%, Si: 0.15% to 1.2%, P: 0.20% to 0.38%, Sn: optionally up to 0.5%, Al: optionally up to 0.05%, Fe: optionally up to 0.3%, Ni: optionally up to 0.3%, Pb: optionally up to 0.25%, Bi: optionally up to 0.1%, Te, Se, In each optionally up to 0.1%, B: optionally up to 0.01%, balance: Zn and unavoidable impurities, where the proportion of unavoidable impurities is less than 0.2% by weight, where the alloy has a microstructure composed of α phase, β phase and phosphide particles, and the proportion of the β phase in the sum total of α phase and β phase is at least 20% by volume and at most 70% by volume, where silicon is present both in the α phase and in the β phase, where, in an area of 21 000 μm 2 , there are 20 to 300 phosphide particles having an equivalent diameter of 0.5 to 1 μm, 30 to 120 phosphide particles having an equivalent diameter of 1 to 2 μm, and 20 to 100 phosphide particles having an equivalent diameter of 2 to 5 μm, and where the proportion of the β phase and the Preliminary Amendment-Page 3 proportions of Si and P are chosen so as to satisfy the condition
92.724
9
-
0.473254
·
[
beta
]
-
80.6378
·
[
Si
]
-
1
4
2
.65
·
[
P
]
+
2
7
9.309
·
[
Si
]
·
[
P
]
<
40
where [beta] denotes the proportion of the β phase in % by volume, [Si] the proportion of silicon in % by weight, and [P] the proportion of phosphorus in % by weight.
2 . The casting material composed of a copper-zinc alloy as claimed in claim 1 , wherein the Pb content is at least 0.02% by weight.
3 . The casting material composed of a copper-zinc alloy as claimed in claim 1 , wherein the ratio of the proportions by weight of P and the sum total of Fe and Ni is more than 2.0.
4 . The casting material composed of a copper-zinc alloy as claimed claim 1 , wherein the proportions of Fe and Ni add up to not more than 0.1% by weight.
5 . The casting material composed of a copper-zinc alloy as claimed in claim 1 , wherein the P content is at least 0.26% by weight and at most 0.33% by weight.
6 . The casting material composed of a copper-zinc alloy as claimed claim 1 , wherein the Si content is at least 0.50% by weight and at most 1.0% by weight.
7 . A process for producing a cast product, wherein the process comprises the following steps:
a) melting a copper-zinc alloy having a composition as claimed in claim 1 , b) casting a cast product with subsequent cooling of the cast product, where the cooling rate within a temperature range from 550 to 350° C. is at least 20° C. per minute and at most 60° C. per minute.
8 . A casting made from a casting material as claimed in claim 1 .Cited by (0)
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